Stay-plaiting mechanism for blank-making machines



Jan. 25, 1938. I D A q 2,106,271

STAY PLAITING MECHANISM FOR BLANK MAKING MACHINES Filed July 22, 1956 2 Sheets-Sheet l Q \4 |1 I I1 Q Q w x mm N lVVE/VTUR.

Q MEMO Jan.25,193s.' MDALLAS 2,106,271

STAY PLAITING MECHANISM FOR BLANK MAKING MACHINES Filed. July 22, 1936 2 Sheets-Sheet Pi J0 g 5 J2 Z I 36 J6 Z7. JZ"' fl J f Egg Yemhmao Fig 'BQ M,

Patented Jan. 25, 1938 UNH'ED PAT OFFICE STAY-PLAITING MECHANISM FOR BLANK- MA KING MACHINES Application July 22, 1936, Serial No. 91,883

11 Claims.

My invention relates to machines by which are produced box-blanks from combined webs including shell-material, furnishing the body of the blank, and thinner stay-material, by which the 5 longitudinal edges of the shell are reinforced. It especially concerns the mechanism by which stay-material adhering in loops to the edges of the shell-web provided with notches may be depressed into these notches in the form of double folds or plaits.

In Letters Patent of the United States No. 1,988,451, Knowlton, January 22, 1935, is disclosed a blank-making machine in which mechanism of this character is included. Here, the traveling webs are presented to a depressing and plaiting disk by a pair of rolls which are depended upon to hold the work in the correct position to receive the action of the disk, from which they are necessarily somewhat spaced along the path of the webs. It is an object of my invention to insure a more symmetrical folding of the stay-material within the notches in the shellmaterial than can invariably be obtained with an organization of the character just mentioned. In the attainment of this object there is employed a rotatable member, which not only depresses the thinner material into the shellnotches but also guides it for such depression. The combined plaiting and guiding member pref- 30 erably comprises a plaiting disk, which may have a V-shaped periphery and contact with the edge of the loop of stay, and a disk at each side of the plaiting disk which guides and centralizes the webs to receive the action of the plaiting disk. Inwardly converging Walls upon the guide-disks may direct the webs to the plaiting position. Since the locating effect is exercised in immediate proximity to the point at which the depressed plaits are to be formed, the center of the loop may be held in accurate registration with the contact-periphery of the disk, and uniformity of the plaits is insured.

A further object of the invention is to provide for the ready arrangement of the plaiting mecha- 45 nism for operation upon work of difierent dimensions. The blanks to be produced may differ both as to length and width. In the former case, since the blanks during formation are advancing, as a part of the Webs, longitudinally between pairs of rolls Which operate upon the work, these rolls must change in diameter as the blank-length is to be altered. This causes the vertical position of the bite of the rolls and consequently the plane in which the work lies to vary. To compensate 55 for this, I arrange for positioning the depressing means in a plane corresponding to that of the work. To provide for the proper action of the disk or other depressing means as the width of the blankis changed, the normal position of the disk toward and from the loop upon which it is to act is varied. In the particular organization herein disclosed, a lever is fulcrumed adjacent to the path of the combined webs and is actuated by a cam upon one of the rolls of the associated operating mechanism. The plaiting disk may rotate in a holder which is variable in position upon a carrier in a direction intersecting the plane of the web, the carrier, in turn, being arranged for adjustment upon the lever in a direction toward and from the web. Moreover, the cam is preferably adjustable to cause it to act in correct time-relation upon notches differently spaced in the material. v

In the accompanying drawings, a particular embodiment of my invention is illustrated,

Fig. 1 being a broken top plan view of my improved crimping mechanism, the upper roll being omitted;

Fig. 2, a transverse section on the line II--lI of Fig. 1;

Fig. 3, an enlarged broken elevation of the crimping and guiding member and its mounting, and 1 Fig. 4, a perspective view of a portion of the Work which has been operated upon.

At l0 appears a portion of the frame of a machine for producing blanks for box-parts, such, for example, as the apparatus of the previously mentioned patent. This frame includes a housing, in which is rotatable in bearings II a pair of rolls l2, [2 operating upon and advancing the work. Rolls of different diameters may be mounted in the bearings, depending upon the length of the blanks to be produced. One of the rolls may carry cutters M which will act against the opposite roll as an abutment to produce successive horseshoe-shaped incisions a (Fig. 4) in the compound webs A advanced between them, and from which blanks are to be formed. These incisions constitute the ends of slots dividing the corner-laps of the finished blanks from the endwings and their extensions, as in the box-blanks produced by the machine of the patent. At the. stage in which the work has reached, the material may consist of a shell-web b of pasteboard or the like, a liner 0' of paper, adhesively attached to one side of the web b, and kraft or other paper stays e, e, also adhesively secured to the opposite margins of both edges of the webs b, c and extending along the longitudinal edges of the completed blanks. Generally, the loops of these stays lie in close proximity to the edges of the shell-material, but at definite intervals along the webs there have been out, before the application of stays, notches q. These notches lie at the outer edges of what are to become the cornerlaps of the box-blanks. They are for the purpose of receiving the turned-in end-wing-extensions to produce flush edges about the entire wall of the set-up box-part. To prevent the stays from interfering with the reception by the notches of the folded-over extensions; it is desired to depress said stays into the notches and,

in doing this, to plait them into two substantially symmetrical folds lying side by side. When thus operated upon, the stay in each notch presents four layers lying side by side, as appears in Fig. 3, instead of two, as is the case with the loop before the plaiting operation has been performed. The strength of the stay-material at the corners of the box, where the severest rupturing strainscome, is thereby greatly increased.

In describing my improved means for accomplishing the symmetrical depression of the staymaterial, but one side of the machine will be considered, it being understood that the mechanism may be duplicated at the opposite side. Secured to the inner face of the frame is a bracket l6 at the rear of the rolls [2, I 2 and approximately at the horizontal plane of the bite of said rolls. Fulcrumed at l8 upon the bracket, and extending forwardly substantially parallel to the plane of the advancing compound web A between the journals 20 of the rolls, is a lever 22. Rotatable upon the outer side of the lever is an antifriction-roll 24 drawn by a spring 26 against the face of a cam-projection 28. The cam is formed upon two plates, one designated as 30 which has a hub 32 fast upon the journal of the lower roll, while the other, 34, is secured'to its companion .by slot-and-screw connections 36. This arrangement permits the time to be varied during which the lever 22 is forced inwardly by the cam-projection. Extending horizontally-from the end of the lever opposite the fulcrum is a carrier-bar 3B, the relation of which to the adjacent edge of the advancing material may be altered by slot-and-screw connections 40. At the inner extremity of the carrier is a vertical bore having a wall divided at 42, and in this bore may be clamped in different vertical relations by a screw 44 a bearing sleeve or holder 46. The sleeve receives rotatably a spindle 48 having fast upon its upper extremity a compound stay-depressing and -plaiting and web-guiding member D. The depressing and plaiting element consists of a relatively thin disk 50 having a V-shaped periphery. Both above and below the disk 50 is a guide-disk 52, the inner face 54 of which lies against that of said disk 50. The space between the two faces 54, 54 is such as to admit and allow the free advance of the combined webs of material with negligible lateral play. The periphery of each of the disks 52, outside the face 54, has an inclined surface 56, these two surfaces 56 converging inwardly to form a throat for the ready reception of the webs.

In using my improved depressing and plaiting mechanism, the disk D, having between its sur faces 54, 54 a space of the proper width to admit and position a compound web A of the thickness to be operated upon, will be applied to the holdersleeve 46. It will be adjusted in a direction substantially perpendicular to the plane of the compound web by a movement of the sleeve in the carrier-bar 38 until the apex of the periphery of the disk 50 lies substantially in horizontal alinement with the longitudinal center-line of the loop of stay 6. The vertical position of the stay will correspond to the diameters of the rolls [2 which are employed. The carrier-bar 38 is positioned horizontally upon the lever 22 to bring the apexof the disk-periphery close to the edge of the shell-web b. The edge of the compound web now travels between the guide-surfaces 54, 54 with the center of the loop of stay in registration with the apex of the disk 50 and retained againstlateral displacement. The sections of the cam 28 are fixed in such a relation that as the web travels by the disk D, contact of the cam with the roll 24 will swing the lever 22 inwardly to force the disk50 against the loop of stay e just as the beginning of a notch q reaches it. The V-periphery of the disk presses the center of the stay into approximate contact with the bottom of the notch, plaiting it into a double loop, the outer edges of which will lie within the notch. When the extremity of the notch arrives at the disk, said disk is released by the cam, and the spring 26 draws it into an inactive position. This is repeated for each notch. It will be seen that the stay-material may not only be disposed effectively within the notches for blanks of all sizes, but that the retention of the blank-material against displacement at the exact point of plaiting action will result in an unfailing symmetry of the double folds within the notches.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a blank-making machine, a rotatable member provided with a portion arranged to act upon the edge of an assembly of shell-material carrying along said edge a projecting loop of thinner material to depress the projecting loop and with portions arranged to guide the assembly with negligible lateral play for such depression.

2. In mechanism for operating upon an assem bly of shell-material carrying along its edge'a projecting loop of thinner material, a disk provided with a V-shaped periphery for contact with the edge of the loop, and means at opposite sides of the disk and substantially parallel therewith for locating the loop transversely with its center in substantial registration with the apex of the disk-periphery.

3. In mechanism for operating upon an assembly of shell-material carrying along its edge a projecting loop of thinner material, a membercomprising a plaiting disk for contact with the edge of the loopand a guide-disk at each side of said loop, the plaiting disk and guide-disks lying in substantially parallel planes.

4. In mechanism for operating upon an assembly of shell-material carrying along its edge a projecting loop of thinner material, a member comprising a plaiting disk provided with a V- shaped periphery for contact with the edge of the loop and guide-disks having substantially parallel walls situated at the opposite sides of the diskperiphery and inclined walls converging inwardly toward the parallel walls.

5. In a blank-making machine, a pair of rolls between which the shell-web and a loop of attached stay-web pass, said rolls being mounted for interchange with other rolls, a rotatable loopplaiting disk co-operating with the rolls near the bite, and means arranged to position the disk differently to correspond to the bite of different rolls.

6. In a blank-making machine, means for advancing shell-material carrying along its edge a projecting loop of thinner material, said advancing means being mounted for interchange with other advancing means, means contacting with the loop in its travel to depress the projecting portion, means arranged to position the depressing means to correspond to different planes in which the material may advance, and means arranged to vary the normal position of the depressing means toward and from the loop.

'7. In a blank-making machine, a pair of rolls between which the shell-Web and a loop of attached stay-web pass, said rolls being mounted for interchange with other rolls, a rotatable loopplaiting disk co-operating with the rolls near the bite, means arranged to position the disk differently to correspond to the bite of difierent rolls, and means arranged to fix the disk in different positions toward and from the path of the webs.

8. In a blank-making machine, a roll for operating upon an advancing web of shell-material carrying along its edge a loop of stay-material, a cam carried by the roll, a lever extending along the path of the material and actuated by the cam, a carrier extending transversely of the lever toward the web, a stay-plaiting disk rotatable upon the carrier, and means arranged to vary the position of the carrier upon the lever toward and from the web.

9. In a blank-making machine, means for operating upon an advancing Web of sheet-material carrying along its edge a loop of stay-material, a lever situated adjacent to the path of the web, means for oscillating the lever, a carrier-bar variable in position upon the lever, a sleeve mounted upon the bar, means for clamping the sleeve in different positions upon the bar, and a stay-plaiting disk rotatable upon the sleeve;

10. In a blank-making machine, a roll for operating upon an advancing web of shell-material carrying along its edge a loop of stay-material, a cam carried by the rollland comprising actuating sections variable in position with respect to each other, a lever extending along the path of the material and actuated by the cam, and a stayplaiting disk rotatable upon the lever.

11. In a blank-making machine, a frame, a pair of rolls rotatable therein and between which is advanced a web of shell-material carrying along its edge a loop of stay-material, a cam rotatable with one of the rolls, a lever fulcrumed upon the frame and extending from its fulcrum-point substantially parallel to the path of the web to receive contact of the cam, and a stay-plaiting disk mounted upon the end of the lever opposite the fulcrum.

ROBER M.- DALLAS 

